removing redundant assignments etc

src/main/java/mi/hdm/MusicPlayer.java

@@ -19,8 +19,6 @@ public class MusicPlayer implements Runnable {
     private final String absoluteFilePath;
 
     private boolean isPlaying;
-    private AudioInputStream audioInputStream = null;
-    private SourceDataLine line = null;
     private final byte[] buffer = new byte[BUFFER_SIZE];
 
     private boolean running = true;
@@ -32,6 +30,7 @@ public class MusicPlayer implements Runnable {
     @Override
     public void run() {
         isPlaying = true;
+        AudioInputStream audioInputStream;
         try {
             audioInputStream = getAudioInputStream(absoluteFilePath);
         } catch (Exception e) {
@@ -40,6 +39,7 @@ public class MusicPlayer implements Runnable {
         }
         final AudioFormat audioFormat = audioInputStream.getFormat();
         final DataLine.Info info = new DataLine.Info(SourceDataLine.class, audioFormat);
+        SourceDataLine line;
         try {
             //get ready to write audio data
             line = (SourceDataLine) AudioSystem.getLine(info);

src/main/java/mi/hdm/components/IngredientLabel.java

@@ -5,11 +5,9 @@ import javafx.scene.text.Text;
 import mi.hdm.recipes.RecipeComponent;
 
 public class IngredientLabel extends HBox {
-    private final RecipeComponent component;
 
     public IngredientLabel(int amount, RecipeComponent component) {
         super();
-        this.component = component;
 
         Text labelAmount = new Text(amount + "    " + component.getMeasurement().getAbbreviation());
         Text labelName = new Text(component.getName());
@@ -19,8 +17,4 @@ public class IngredientLabel extends HBox {
         setSpacing(16.0);
         setStyle("-fx-padding: 5px;");
     }
-
-    public RecipeComponent getComponent() {
-        return component;
-    }
 }

src/main/java/mi/hdm/exceptions/MissingContentException.java

@@ -6,12 +6,10 @@ import java.lang.reflect.Type;
  * This exception is thrown when no object is found for a code.
  */
 public class MissingContentException extends Exception {
-    private final Type type;
     private final String code;
 
     public MissingContentException(String code, Type type) {
         super("Missing content exception: no instance of '" + type.getTypeName() + "' was found with code '" + code + "'");
-        this.type = type;
         this.code = code;
     }
 

src/main/java/mi/hdm/recipes/NutritionCalculator.java

@@ -15,6 +15,7 @@ public class NutritionCalculator {
      *
      * @return the nutrition table for this recipe based on its ingredients. All nutrition values are added up.
      */
+    @SuppressWarnings("BigDecimalMethodWithoutRoundingCalled")
     public static NutritionTable calculateNutritionTable(Map<RecipeComponent, Integer> ingredients) {
         if (ingredients == null || ingredients.isEmpty()) {
             log.info("Map ingredients is null or empty. Therefore new nutritionTable() was generated.");